CN2185481Y - DC solid relay with overcurrent protection - Google Patents
DC solid relay with overcurrent protection Download PDFInfo
- Publication number
- CN2185481Y CN2185481Y CN 94226636 CN94226636U CN2185481Y CN 2185481 Y CN2185481 Y CN 2185481Y CN 94226636 CN94226636 CN 94226636 CN 94226636 U CN94226636 U CN 94226636U CN 2185481 Y CN2185481 Y CN 2185481Y
- Authority
- CN
- China
- Prior art keywords
- utility
- model
- relay
- solid
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a DC solid relay, which comprises an input end 1, a DC solid relay 2, an output electric current testing circuit 3 and an over-current protection circuit 4. The utility model is characterized in that the over-current protection circuit 4 is composed of a current-limiting resistor and a controlled silicon, and the function of the output electric current testing circuit is achieved by a fixed resistor. The utility model only adds the controlled silicon and the resistor, and the protective action and the output current variation are synchronous, which performs the function of transient response protection to guarantee that the main circuit of the utility model can not be damaged because of load failures; when the failures are not excluded, the relay of the utility model can not be opened, and when the failures are excluded, as long as the input end is fed with control signals, the relay of the utility model works normally without manual resetting.
Description
The utility model relates to a kind of dc solid-state relay.
At present; existing dc solid-state relay is protected for the common working load of the fault loop serial connection fast acting fuse that load circuit occurs; because the restriction of fast acting fuse reaction speed; when big electric current that produces for moment even load short circuits fault; often moment is just caused the permanent damages of dc solid-state relay internal circuit, can not effectively protect.
The purpose of this utility model provides a kind of dc solid-state relay with overcurrent protection.
The utility model can be realized by following technical proposal:
The utility model comprises input, dc solid-state relay, output current test, overcurrent protection, and it is characterized in that: described overcurrent protection is made up of current-limiting resistance and thyristor.The output current test is finished by the resistance that is serially connected on the output loop.When the utility model uses, send control signal to dc solid-state relay by input circuit, in the dc solid-state relay output loop, pass through a serial resistance test load electric current, when load current when normal value is following, this ohmically test voltage deficiency is so that the controllable silicon conducting, the circuit operate as normal.Cause that load current increases when exceeding normal value in case load is broken down, the voltage drop on the test resistance will make the controllable silicon conducting rapidly, cause dc solid-state relay to end rapidly.
The utility model compared with prior art has following advantage:
Only increased thyristor and resistance in the circuit, protection action changes with output current and carries out synchronously, plays the transient response protective effect, guarantees not reason load faulty and damaging of relay main circuit.And when fault is not got rid of, can't open relay all the time, and after fault was removed, as long as input feeds control signal, relay is operate as normal immediately, need not manual reset.
The utility model will be further described below in conjunction with drawings and Examples:
Accompanying drawing 1 is a circuit block diagram of the present utility model;
Accompanying drawing 2 is circuit theory diagrams of the present utility model.
Embodiment: referring to Fig. 2 circuit theory diagrams.Input 1 is made up of optoelectronic isolating element A, and dc solid-state relay 2 is by T1, T2 and respectively limits load resistance to form, and output current is tested 3 and finished by resistance R 3, and overcurrent protection 4 is made up of resistance R 4 and controlled member S.The circuit basic principle is; circuit is controlled by input; T1 and T2 are operated in conducting respectively and end two kinds of operating states; when output load generation fault causes current anomaly to increase; be serially connected in that electric current increases in the resistance R 3 of T2 emitter, making R3 go up voltage increases, when reaching certain numerical value; start conducting thyristor S by current-limiting resistance R4; to cause input level zero potential after the S conducting, T1 ends rapidly also ends T2 rapidly, thereby makes the load current blocking-up; protected the main element T2 of relay; after fault was removed, the last voltage drop of R3 was low, and thyristor S recovers cut-off state; protective circuit is inoperative, this relay recovery operate as normal.
Claims (2)
1, a kind of dc solid-state relay with overcurrent protection comprises input 1, dc solid-state relay 2, output current test 3, overcurrent protection 4, and it is characterized in that: described overcurrent protection 4 is made up of current-limiting resistance and thyristor.
2, a kind of dc solid-state relay with overcurrent protection according to claim 1 is characterized in that: above-mentioned described output current test 3 is finished by fixed resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94226636 CN2185481Y (en) | 1994-01-15 | 1994-01-15 | DC solid relay with overcurrent protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94226636 CN2185481Y (en) | 1994-01-15 | 1994-01-15 | DC solid relay with overcurrent protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2185481Y true CN2185481Y (en) | 1994-12-14 |
Family
ID=33839561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94226636 Expired - Fee Related CN2185481Y (en) | 1994-01-15 | 1994-01-15 | DC solid relay with overcurrent protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2185481Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049075C (en) * | 1998-05-15 | 2000-02-02 | 青岛高科技工业园金斯达通信开发有限公司 | Realizing method and device for protecting and warning when resistance of security device losing efficacy |
| CN105453432A (en) * | 2013-08-08 | 2016-03-30 | 泰科电子公司 | Solid state relay protective device |
| CN107302352A (en) * | 2016-04-14 | 2017-10-27 | 安世有限公司 | Solid-state relay |
-
1994
- 1994-01-15 CN CN 94226636 patent/CN2185481Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049075C (en) * | 1998-05-15 | 2000-02-02 | 青岛高科技工业园金斯达通信开发有限公司 | Realizing method and device for protecting and warning when resistance of security device losing efficacy |
| CN105453432A (en) * | 2013-08-08 | 2016-03-30 | 泰科电子公司 | Solid state relay protective device |
| CN107302352A (en) * | 2016-04-14 | 2017-10-27 | 安世有限公司 | Solid-state relay |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203787935U (en) | Over-current protection circuit based on high side current detection | |
| CN102315632B (en) | Driving circuit for inhibiting over current of IGBT (Insulated Gate Bipolar Transistor) | |
| CN102013802B (en) | BOOST circuit with short circuit protection function | |
| CN101316038A (en) | Control circuit of multifunctional protection socket | |
| CN103872658A (en) | Multifunctional self-recovery over-voltage and under-voltage protector | |
| CN108832590B (en) | Overcurrent protection relay | |
| CN113113894A (en) | Power failure detection and power supply protection circuit | |
| CN2185481Y (en) | DC solid relay with overcurrent protection | |
| CN205960624U (en) | Switch power -supply overvoltage protecting circuit | |
| CN101964512A (en) | Electric leakage protector with overvoltage protective device | |
| CN2308191Y (en) | Over voltage automtic power-off protection circuit | |
| CN200976576Y (en) | Plane solid state relay for short circuit and overload protection | |
| CN108666980B (en) | A kind of discharge fault integration protection circuit | |
| CN201260066Y (en) | Control circuit for multifunctional protection socket | |
| CN106026017A (en) | Leakage breaker with over-voltage protection and under-voltage protection | |
| CN201007991Y (en) | Short circuit, overload safeguard for transistor output | |
| CN220325272U (en) | Multifunctional high-efficiency protection system for vehicle-mounted interface | |
| CN111786354B (en) | Thyristor short-circuit protection circuit and device | |
| CN2205071Y (en) | Simple and reliable safety unit for household electric appliances | |
| CN213243519U (en) | Parallel power output low voltage and short circuit protection circuit | |
| CN211376531U (en) | Electronic type thermal relay contact expanding unit | |
| CN214626328U (en) | Be applied to undervoltage autoeclosing controlling means of universal circuit breaker | |
| CN201435767Y (en) | Camera protective plate and camera | |
| CN208424203U (en) | Unisolated switch power supply with intelligent protection circuit | |
| CN201160220Y (en) | Passive thread type motor protecting equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |